39-Y - 89
39-Y - 89 JNDC EVAL-MAR90 JNDC FP NUCLEAR DATA W.G.
DIST-SEP90 REV2-NOV93
----JENDL-3.2 MATERIAL 3925
-----INCIDENT NEUTRON DATA
------ENDF-6 FORMAT
HISTORY
84-10 EVALUATION FOR JENDL-2 WAS MADE BY JNDC FPND W.G./1/
90-03 MODIFICATION FOR JENDL-3 WAS MADE/2/.
93-11 JENDL-3.2 WAS MADE BY JNDC FPND W.G.
***** MODIFIED PARTS FOR JENDL-3.2 ********************
(2,151) RESOLVED RESONANCE PARAMETERS
***********************************************************
MF = 1 GENERAL INFORMATION
MT=451 COMMENTS AND DICTIONARY
MF = 2 RESONANCE PARAMETERS
MT=151 RESOLVED AND UNRESOLVED RESONANCE PARAMETERS
RESOLVED RESONANCE REGION (MLBW FORMULA) : BELOW 48 KEV
RESONANCE PARAMETERS WERE TAKEN FROM JENDL-2 AFTER SLIGHT
MODIFICATION.
FOR JENDL-2, RESONANCE ENERGIES WERE TAKEN FROM BOLDEMAN ET
AL./3/ FOR THE LEVELS BELOW 47 KEV AND CAMARDA ET AL./4/ FOR
THOSE ABOVE 50 KEV. FOR THE NEUTRON WIDTHS, ADOPTED WERE
AVERAGE VALUES OF MORGENSTERN ET AL./5/, BOLDEMAN ET AL. AND
CAMARDA ET AL. THE RADIATION WIDTHS WERE DERIVED FROM CAPTURE
AREAS MEASURED BY BOLDEMAN ET AL.
AVERAGE RADIATION WIDTH = 0.123 +- 0.027 EV FOR S-WAVE RES.
0.279 +- 0.127 EV FOR P-WAVE RES.
THE SCATTERING RADIUS OF 6.7 FM WAS TAKEN FROM REF./6/.
FOR JENDL-3, ONLY TOTAL SPIN J AND ANGULAR MOMENTUM L OF
SOME RESONANCES WERE ESTIMATED WITH A RANDOM NUMBER METHOD AND
A METHOD OF BOLLINGER AND THOMAS/7/, RESPECTIVELY. A NEGATIVE
RESONANCE AT -251 EV WAS ADDED SO AS TO REPRODUCE THE THERMAL
CAPTURE AND SCATTERING CROSS SECTIONS GIVEN BY MUGHABGHAB ET
AL./6/
FOR JENDL-3.2, THE PARAMETERS FOR LEVELS MEASURED BY
BOLDEMAN ET AL. IN THE ENERGY RANGE UP TO 46.07 KEV WERE
REEVALUATED USING THEIR CAPTURE AREAS MULTIPLIED BY A FACTOR
OF 1.036 ACCORDING TO A CORRIGENDUM REPORTED BY ALLEN ET
AT./8/
UNRESOLVED RESONANCE REGION : 48 KEV - 100 KEV
UNRESOLVED RESONANCE PARAMETERS WERE ADOPTED FROM JENDL-2.
THE NEUTRON STRENGTH FUNCTIONS, S0 AND S1 WERE ADOPTED FROM
THE RECOMMENDATION IN REF./9/, AND WAS CALCULATED WITH
OPTICAL MODEL CODE CASTHY/10/. THE OBSERVED LEVEL SPACING WAS
DETERMINED TO REPRODUCE THE CAPTURE CROSS SECTION CALCULATED
WITH CASTHY. THE EFFECTIVE SCATTERING RADIUS WAS OBTAINED
FROM FITTING TO THE CALCULATED TOTAL CROSS SECTION AT 100 KEV.
TYPICAL VALUES OF THE PARAMETERS AT 70 KEV:
S0 = 0.320E-4, S1 = 4.400E-4, S2 = 0.360E-4, SG = 0.626E-4,
GG = 0.132 EV, R = 7.235 FM.
CALCULATED 2200-M/S CROSS SECTIONS AND RES. INTEGRALS (BARNS)
2200 M/S RES. INTEG.
TOTAL 8.9900 -
ELASTIC 7.7127 -
CAPTURE 1.2773 0.870
MF = 3 NEUTRON CROSS SECTIONS
BELOW 100 KEV, RESONANCE PARAMETERS WERE GIVEN.
ABOVE 100 KEV, THE SPHERICAL OPTICAL AND STATISTICAL MODEL
CALCULATION WAS PERFORMED WITH CASTHY, BY TAKING ACCOUNT OF
COMPETING REACTIONS, OF WHICH CROSS SECTIONS WERE CALCULATED
WITH PEGASUS/11/ STANDING ON A PREEQUILIBRIUM AND MULTI-STEP
EVAPORATION MODEL. THE OMP'S FOR NEUTRON GIVEN IN TABLE 1 WERE
DETERMINED BY IIJIMA AND KAWAI/12/ TO REPRODUCE A SYSTEMATIC
TREND OF THE TOTAL CROSS SECTION. THE OMP'S FOR CHARGED
PARTICLES ARE AS FOLLOWS:
PROTON = PEREY/13/
ALPHA = HUIZENGA AND IGO/14/
DEUTERON = LOHR AND HAEBERLI/15/
HELIUM-3 AND TRITON = BECCHETTI AND GREENLEES/16/
PARAMETERS FOR THE COMPOSITE LEVEL DENSITY FORMULA OF GILBERT
AND CAMERON/17/ WERE EVALUATED BY IIJIMA ET AL./18/ MORE
EXTENSIVE DETERMINATION AND MODIFICATION WERE MADE IN THE
PRESENT WORK. TABLE 2 SHOWS THE LEVEL DENSITY PARAMETERS USED
IN THE PRESENT CALCULATION. ENERGY DEPENDENCE OF SPIN CUT-OFF
PARAMETER IN THE ENERGY RANGE BELOW E-JOINT IS DUE TO GRUPPELAAR
/19/.
MT = 1 TOTAL
SPHERICAL OPTICAL MODEL CALCULATION WAS ADOPTED.
MT = 2 ELASTIC SCATTERING
CALCULATED AS (TOTAL - SUM OF PARTIAL CROSS SECTIONS).
MT = 4, 51 - 91 INELASTIC SCATTERING
SPHERICAL OPTICAL AND STATISTICAL MODEL CALCULATION WAS
ADOPTED. THE LEVEL SCHEME WAS TAKEN FROM REF./20/.
NO. ENERGY(MEV) SPIN-PARITY
GR. 0.0 1/2 -
1 0.9091 9/2 +
2 1.5074 3/2 -
3 1.7445 5/2 -
4 2.2210 5/2 +
5 2.5299 7/2 +
6 2.5664 11/2 +
7 2.6222 9/2 +
8 2.8710 7/2 +
9 2.8820 3/2 -
10 3.0680 3/2 -
11 3.1060 5/2 -
12 3.1380 5/2 -
LEVELS ABOVE 3.502 MEV WERE ASSUMED TO BE OVERLAPPING.
MT = 102 CAPTURE
SPHERICAL OPTICAL AND STATISTICAL MODEL CALCULATION WITH
CASTHY WAS ADOPTED. DIRECT AND SEMI-DIRECT CAPTURE CROSS
SECTIONS WERE ESTIMATED ACCORDING TO THE PROCEDURE OF BENZI
AND REFFO/21/ AND NORMALIZED TO 1 MILLI-BARN AT 14 MEV.
THE GAMMA-RAY STRENGTH FUNCTION (5.95E-05) WAS ADJUSTED TO
REPRODUCE THE CAPTURE CROSS SECTION OF 13 MILLI-BARNS AT 70
KEV MEASURED BY MUSGROVE ET AL./22,8/
MT = 16 (N,2N) CROSS SECTION
MT = 22 (N,N'A) CROSS SECTION
MT = 28 (N,N'P) CROSS SECTION
MT = 32 (N,N'D) CROSS SECTION
MT =103 (N,P) CROSS SECTION
MT =104 (N,D) CROSS SECTION
MT =105 (N,T) CROSS SECTION
MT =106 (N,HE3) CROSS SECTION
MT =107 (N,ALPHA) CROSS SECTION
THESE REACTION CROSS SECTIONS WERE CALCULATED WITH THE
PREEQUILIBRIUM AND MULTI-STEP EVAPORATION MODEL CODE PEGASUS.
THE KALBACH'S CONSTANT K (= 299.5) WAS ESTIMATED BY THE
FORMULA DERIVED FROM KIKUCHI-KAWAI'S FORMALISM/23/ AND LEVEL
DENSITY PARAMETERS.
FINALLY, THE (N,2N), (N,P) AND (N,ALPHA) CROSS SECTIONS WERE
NORMALIZED TO THE FOLLOWING VALUES AT 14.5 MEV:
(N,2N) 980.00 MB (RECOMMENDED BY BYCHKOV+/24/)
(N,P) 25.00 MB (RECOMMENDED BY FORREST/25/)
(N,ALPHA) 5.50 MB (RECOMMENDED BY FORREST)
MT = 251 MU-BAR
CALCULATED WITH CASTHY.
MF = 4 ANGULAR DISTRIBUTIONS OF SECONDARY NEUTRONS
LEGENDRE POLYNOMIAL COEFFICIENTS FOR ANGULAR DISTRIBUTIONS ARE
GIVEN IN THE CENTER-OF-MASS SYSTEM FOR MT=2 AND DISCRETE INELAS-
TIC LEVELS, AND IN THE LABORATORY SYSTEM FOR MT=91. THEY WERE
CALCULATED WITH CASTHY. FOR OTHER REACTIONS, ISOTROPIC DISTRI-
BUTIONS IN THE LABORATORY SYSTEM WERE ASSUMED.
MF = 5 ENERGY DISTRIBUTIONS OF SECONDARY NEUTRONS
ENERGY DISTRIBUTIONS OF SECONDARY NEUTRONS WERE CALCULATED WITH
PEGASUS FOR INELASTIC SCATTERING TO OVERLAPPING LEVELS AND FOR
OTHER NEUTRON EMITTING REACTIONS.
TABLE 1 NEUTRON OPTICAL POTENTIAL PARAMETERS
DEPTH (MEV) RADIUS(FM) DIFFUSENESS(FM)
---------------------- ------------ ---------------
V = 46.0-0.25E R0 = 5.893 A0 = 0.62
WS = 7.0 RS = 6.393 AS = 0.35
VSO= 7.0 RSO= 5.893 ASO= 0.62
THE FORM OF SURFACE ABSORPTION PART IS DER. WOODS-SAXON TYPE.
TABLE 2 LEVEL DENSITY PARAMETERS
NUCLIDE SYST A(1/MEV) T(MEV) C(1/MEV) EX(MEV) PAIRING
---------------------------------------------------------------
37-RB- 85 1.190E+01 8.690E-01 2.827E+00 7.561E+00 1.460E+00
37-RB- 86 1.002E+01 8.500E-01 3.954E+00 4.312E+00 0.0
37-RB- 87 8.806E+00 9.410E-01 1.125E+00 5.465E+00 9.300E-01
37-RB- 88 9.801E+00 8.185E-01 2.880E+00 3.704E+00 0.0
38-SR- 86 1.120E+01 8.900E-01 5.328E-01 8.599E+00 2.700E+00
38-SR- 87 1.030E+01 8.610E-01 1.186E+00 5.938E+00 1.240E+00
38-SR- 88 9.160E+00 7.510E-01 8.288E-02 4.550E+00 2.170E+00
38-SR- 89 9.380E+00 8.200E-01 5.043E-01 4.642E+00 1.240E+00
39-Y - 87 * 1.388E+01 7.471E-01 2.541E+00 6.730E+00 1.460E+00
39-Y - 88 1.109E+01 7.450E-01 3.738E+00 3.570E+00 0.0
39-Y - 89 7.900E+00 8.500E-01 3.983E-01 3.440E+00 9.300E-01
39-Y - 90 1.027E+01 6.770E-01 1.716E+00 2.209E+00 0.0
---------------------------------------------------------------
SYST: * = LDP'S WERE DETERMINED FROM SYSTEMATICS.
SPIN CUTOFF PARAMETERS WERE CALCULATED AS 0.146*SQRT(A)*A**(2/3).
IN THE CASTHY CALCULATION, SPIN CUTOFF FACTORS AT 0 MEV WERE
ASSUMED TO BE 6.916 FOR Y - 89 AND 5.0 FOR Y - 90.
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